40 Chapter 2 Introducing the BCM hardwareN0060612N0060612Base function tray internal componentsThe base function tray installs in the main unit and houses the main card with the systeminterfaces.Figure 9 illustrates the base function tray layout (BCM200 configuration shown). Table 6describes the internal components.Figure 9 Base function tray internal componentsTable 5 Base function tray faceplate component descriptionsComponent DescriptionSystem Status LEDs The system status display LEDs indicate the current status of the hardwarecomponents (see “Base function tray system status display LEDs” on page 77).Reset button The reset button restarts the BCM system.WAN card The WAN card (field upgrade) connects the BCM system to the wide area network(WAN). See “WAN interface card” on page 46.Media services card (MSC) The MSC performs call processing and media processing of the voice channels forthe BCM system. See “Media services card (MSC)” on page 41.USB (universal serial bus)portThe two USB ports connect USB-compatible peripherals to the BCM system.Modem port The modem port provides PSTN dial-up access to the BCM system.COM port (or serial port) The COM port provides a serial connection to a laptop for maintenance purposes.See “Connecting through the serial port” on page 181.Ethernet port 2 Ethernet port 2 provides access to the internal local area network.Ethernet port 1 Ethernet port 1 provides access to the external local area network.MSCSystem Status LEDsMSC mountingscrewsPEC IIIslotsDS256 interface
